at
$12.50 PER SHARE, PLUS ONE NON-TRANSFERABLE CONTINGENT VALUE RIGHT FOR EACH SHARE, WHICH REPRESENTS THE CONTRACTUAL RIGHT TO RECEIVE $0.50 PER SHARE FOLLOWING APPROVAL BY THE FDA OF THE NEW DRUG APPLICATION FOR CORPLEX DONEPEZIL ON OR PRIOR TO MARCH 31, 2020, AS DESCRIBED IN AND UNDER THE CONDITIONS SET FORTH IN THE CONTINGENT VALUE RIGHTS AGREEMENT

THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT ONE MINUTE PAST 11:59 P.M., NEW YORK CITY TIME, ON NOVEMBER 26, 2018, UNLESS THE OFFER IS EXTENDED OR EARLIER TERMINATED.

This Notice of Guaranteed Delivery, or one substantially in the form hereof, must be used to accept the Offer (as defined below) if (i) certificates representing shares of common stock, par value $0.001 per share (the "Share Certificates"), of Corium International, Inc., a Delaware corporation, are not immediately available, (ii) the procedure for book-entry transfer cannot be completed on a timely basis or (iii) time will not permit all required documents to reach Continental Stock Transfer & Trust Company, (the "Depositary") prior to the expiration of the Offer. This Notice of Guaranteed Delivery may be delivered by manually signed facsimile transmission, mail or overnight courier to the Depositary and must include a Guarantee by an Eligible Institution (as defined in Section 3 of the Offer to Purchase). See Section 3 of the Offer to Purchase.


If delivering by mail: Continental Stock Transfer & Trust Company Attention: Corporate Actions Department 1 State Street- 30th Floor New York, NY 10004		If delivering by hand, express mail, courier or any other expedited service: Continental Stock Transfer & Trust Company Attention: Corporate Actions Department 1 State Street- 30th Floor New York, NY 10004

DELIVERY OF THIS INSTRUMENT TO AN ADDRESS, OR TRANSMISSION OF INSTRUCTIONS VIA FACSIMILE TRANSMISSION, OTHER THAN AS SET FORTH ABOVE, WILL NOT CONSTITUTE A VALID DELIVERY TO THE DEPOSITARY.

THIS FORM IS NOT TO BE USED TO GUARANTEE SIGNATURES. IF A SIGNATURE ON A LETTER OF TRANSMITTAL IS REQUIRED TO BE GUARANTEED BY AN "ELIGIBLE INSTITUTION" UNDER THE INSTRUCTIONS THERETO, SUCH SIGNATURE GUARANTEE MUST APPEAR IN THE APPLICABLE SPACE PROVIDED IN THE SIGNATURE BOX ON THE APPROPRIATE LETTER OF TRANSMITTAL.

The Eligible Institution that completes this form must communicate the guarantee to the Depositary and must deliver the Letter of Transmittal or an Agent's Message (as defined in Section 2 of the Offer to Purchase) and Share Certificates to the Depositary within the time period shown herein. Failure to do so could result in a financial loss to such Eligible Institution.

Pursuant to the guaranteed delivery procedures set forth in Section 3 of the Offer to Purchase, the undersigned hereby tenders to Gurnet Merger Sub, Inc., a Delaware corporation and a wholly-owned subsidiary of Gurnet Holding Company, a Delaware corporation, the number of shares of common stock, par value $0.001 per share (the "Shares"), of Corium International, Inc., a Delaware corporation, specified below, upon the terms and subject to the conditions set forth in the Offer to Purchase, dated October 26, 2018, the related Letter of Transmittal and the Notice of Guaranteed Delivery (which, together with the Offer to Purchase, as they may be amended or supplemented from time to time, collectively constitute the "Offer"). The undersigned hereby acknowledges receipt of the Letter of Transmittal.

The undersigned, an Eligible Institution (as defined in Section 3 of the Offer to Purchase), hereby (i) represents that the above-named person(s) "own(s)" the Shares tendered hereby within the meaning of Rule 14e-4 under the Securities Exchange Act of 1934, as amended ("Rule 14e-4"), (ii) represents that the tender of Shares effected hereby complies with Rule 14e-4, and (iii) guarantees delivery to Continental Stock Transfer & Trust Company (the "Depositary"), at one of its addresses set forth above, of certificates representing the Shares tendered hereby, in proper form for transfer, or a confirmation of a book-entry transfer of such Shares into the Depositary's account at The Depository Trust Company, in either case together with a properly completed and duly executed Letter of Transmittal (or facsimile thereof) or, in the case of a book-entry transfer, an Agent's Message (as defined in Section 2 of the Offer to Purchase), together with any other documents required by the Letter of Transmittal, all within two (2) Nasdaq Stock Market trading days after the date hereof.

Name of Firm

Address

Zip Code

Area Code and Telephone No.

Authorized Signature

Name (Please Print or Type)

Title

NOTE: DO NOT SEND CERTIFICATES FOR SHARES WITH THIS NOTICE.
CERTIFICATES SHOULD BE SENT WITH YOUR LETTER OF TRANSMITTAL.


Certificate Number(s) (if available):

		(Please type or print)


Name(s) of Record Holder(s):


Number of Shares Tendered:


Address(es):

		(Zip Code)


Name of Tendering Institution: